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中文摘要：
定量超声评价长骨骨折已成为近年来的研究热点之一，超声导波模式转换理论可被应用于长骨骨折状况的评价。采用三维时域有限差分法分析骨折长骨中导波模式转换的基本规律，提取模式转换定量评价参数；进而结合亚克力管仿体实验，分析不同裂纹程度下导波模式的转换情况。仿真与仿体实验表明，导波模式能量参数与裂纹程度具有很好的相关性，可用于评价长骨骨折状况。
英文摘要：
Using ultrasonic guided waves to assess long bone fracture status has drawn significant research interests. The study aimed to investigate the feasibility of ultrasonic guided-mode conversion theory for long cortical bone fracture evaluation. In this article, the principle of guided waves mode conversion in the fractured long bone was analyzed using three-dimension finite-difference time-domain （3D-FDTD）, and quantitative parameters were proposed to evaluate the fracture status. The mode conversion theory was applied to analyze different fractures in phantom experiment. Both numerical simulation and phantom experiment indicated that the energy parameter of ultrasonic guided mode conversion correlated strongly with fracture depth, which may offer great potentials for the long bone fracture evaluation.
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